A pulse-width-to-voltage (PWV) converter, comprises: a switch, a capacitor, a current source, and a current sink. The switch is operable by a signal. The current source, the current sink, and the switch are serially connected across a high voltage potential and a low voltage potential. An output node is coupled to a serial connection between the current source and the current sink. An end of the capacitor is coupled to the output node for converting a current into a control voltage indicative of a duty cycle of the signal.

A pulse-width-to-voltage (PWV) converter, comprises: a switch, a capacitor, a current source, and a current sink. The switch is operable by a signal. The current source, the current sink, and the switch are serially connected across a high voltage potential and a low voltage potential. An output node is coupled to a serial connection between the current source and the current sink. An end of the capacitor is coupled to the output node for converting a current into a control voltage indicative of a duty cycle of the signal.

A filter circuit comprises a resistor-capacitor (RC) circuit, a comparator circuit, and an output control circuit. The RC circuit is configured to generate a ripple voltage according to the PWM signal. The comparator circuit couples with the RC circuit, and is configured to compare the ripple voltage with a first reference voltage, and output a switch signal according to a comparison result. The output control circuit couples with the comparator circuit and the RC circuit, and is configured to generate an output signal according to the switch signal and the PWM signal. When a duty ratio of the PWM signal is larger than a predetermined threshold value, the output signal is corresponding to the PWM signal. When the duty ratio of the PWM signal is smaller than the predetermined threshold value, the output signal is not corresponding to the PWM signal.

A receiving circuit, a transmission circuit and a system capable of reducing the effect of noise are provided. The receiving circuit includes: a pulse width detection unit which determines whether or not the pulse width of a pulse signal outputted based on comparison between a received-signal voltage and a reference voltage is smaller than a predetermined width; a reference voltage setting unit which, when the pulse width is smaller than the predetermined width, sets the reference voltage to be equal to or higher than a predetermined voltage; and an output control unit which, when the pulse width is equal to or larger than the predetermined width, causes a digital signal based on the pulse signal to be outputted or, when the pulse width is smaller than the predetermined width, performs control not to output the digital signal.

A data carrier apparatus includes: a first determination unit configured to determine a duty ratio of each pulse of a pulse signal that is received; a second determination unit configured to determine a period of each pulse of the pulse signal; and a third determination unit configured to determine a value of data being carried by the pulse signal based on a determination result of the first determination unit and a determination result of the second determination unit.

A transmission device outputs a modulated signal based on amplitude information and phase information respectively indicating an amplitude and a phase of a transmission symbol. The transmission device includes: an oscillation signal generation circuit configured to generate an oscillation signal based on the phase information; a laser light source configured to be driven by the oscillation signal; a bias controller configured to control a bias current of the laser light source based on the amplitude information; a photo detector configured to convert an output light of the laser light source into an electric signal; and a bandpass filter configured to filter an output signal of the photo detector so as to output the modulated signal.

A circuit for evaluating measurement signals of at least one sensor with a control circuit. A control signal having a first frequency is generated by a control section of the control circuit, and the control signal is applied to the sensor. An electronic evaluation unit is provided for generating an evaluation signal originating from a measurement signal generated by the sensor. The electronic evaluation unit generates an opposing signal having the first frequency and a modifiable phase angle and superposes the opposing signal and the evaluation signal. The signal resulting from the superposition of the opposing signal and the evaluation signal is fed to a synchronous demodulator of the electronic evaluation unit.

The invention relates to a method for detecting a control method of an inverter (11) for supplying current to an electric machine (1), in particular a synchronous machine, having N phases. The method comprises sensing a control signal (CU, DU, CV, DV, CW, DW), which is fed to the inverter and which is clocked with a periodic cycle, over a specified number of periodic cycles of the control signal; determining a duty cycle frequency for the sensed control signal over the specified number of periodic cycles; and detecting the control method on the basis of the determined duty cycle frequency. The invention further relates to a device (5) designed to perform the method. In addition, the invention further relates a use of the method or of the device to monitor a torque of the electric machine and in particular to estimate an operating-point-dependent power loss of the electric machine according to the detected control method.

A power drive circuit is disclosed. The power circuit includes: a pulse detector, configured to generate first and second control signals in response to first and second pulse signals, respectively. The power drive circuit also includes a state storage device, configured to generate first and second driver input signals in response to the first and second control signals, respectively. The power drive circuit also includes a driver configured to generate first and second gate drive signals in response to the first and second driver input signals, respectively. The power drive circuit also includes a power switch, configured to receive the first and second gate drive signals, where the first and second gate drive signals control the power switch to selectively conduct or not conduct current between first and second terminals.

A power drive circuit is disclosed. The power circuit includes: a pulse detector, configured to generate first and second control signals in response to first and second pulse signals, respectively. The power drive circuit also includes a state storage device, configured to generate first and second driver input signals in response to the first and second control signals, respectively. The power drive circuit also includes a driver configured to generate first and second gate drive signals in response to the first and second driver input signals, respectively. The power drive circuit also includes a power switch, configured to receive the first and second gate drive signals, where the first and second gate drive signals control the power switch to selectively conduct or not conduct current between first and second terminals.